I don't imagine the libertarian party considers "private security services" here in the U.S. to be the same thing as mercenaries deployed in a foreign nation. one more time: " Any U.S. military policy should have the objective of providing security for the lives, liberty and property of the American people in the U.S. against the risk of attack by a foreign power." Application of private security forces intended for domestic use would be excluded by this statement on how and why military force should be used outside the U.S. It wouldn't include supporting foreign exploitation and investment for those acting and owning over seas.